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An agent's shell commands can print thousands of lines the model then reads in full on every later call. joulehook-compress runs the command, keeps its whole output under its BLAKE3 digest, and prints a view made by deterministic, versioned rules (compress/1): terminal formatting dropped; a repeated line said once with its count; four or more lines alike but for their numbers kept as first and last; passing tests and build progress said as counts for a recognised test run or cargo build; past a length budget, the head, the tail and the lines between that look like trouble, each gap marked. A view that leaves anything out ends by naming the digest and how to read it whole; the store refuses a file whose bytes do not hash to its name. Exit status and the error stream are kept. Each run appends a record with the digests and exact byte and line counts; tokens are counted at the model boundary, not estimated. The gate rewrites an allowed shell action into it (SPEC §3.5) only where nothing else changes: on a host whose hook documents a rewrite field (Claude Code's updatedInput), not for a background command, not for one already going through the compressor, and only for a command that runs the same in a child shell; a cd, export, source, shell option, here-doc or substitution is left alone. The sealed decision is over the action as asked; the rewrite is a function of it and the configuration. Falsified, each turns a test red: a store that trusts its files, unseen substitutions, cd as harmless, trouble not kept past the budget, no footer, exit status dropped, background commands rewritten, and any host rewriting (which also showed a decision could claim a compression that did not happen; the test now checks the claim). Co-Authored-By: Claude Opus 5.5 <[email protected]> |
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